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2-Ply Aluminum Flex Vent
The minimum vent system for horizontal termination must consist of:
8" (203.2 mm) vertical length (measured to center of vent pipe) with a 90 degree bend and a
maximum 16" (406.4 mm) horizontal length (measured from center of vent pipe)
Wall thimble part# B92
Horizontal termination cap part # 1393
The maximum horizontal vent system consists of:
34' (10363 mm) vertical length with 3 - 90 degree bends and a 20' (6096 mm) horizontal
length (measured to center of vent pipe)
Wall thimble part# 1392
Horizontal termination cap part # 1393
Note: 2-Ply Horizontal venting shall be supported, by means of a steel strap, every 3'.
34'
H2
V1
B
B
A
H1
A
Diagram not to scale
EXAMPLES MINIMUM VERTICAL (V1 + V2) MAXIMUM HORIZONTAL (H1 + H2 + H3 + H4)
Example: Where A---A = Vertical @ 2'
And B---B = Horizontal @ 5')
H3
Restrict @ 60%
V2
Restrict @ 40%
Restrict @ 20%
20'
4'
8'
Through the roof terminations must
use certified hard pipe products listed
with Dura-Vent, Selkirk Venting, Icc
Venting, Security Venting or Metal-
Fab Venting with items shown below
connecting to a flex to rigid adapter
with a 4" to 4"adp and a 6" to
6.625"adp.
Flex to Rigid Adapter p/n 0926I
Adapter p/n BONTTRK-adp
10'
20'
MAXIMUM VERTICAL HEIGHT = 34'
MAXIMUM HORIZONTAL OFFSETS = 20'
MAXIMUM 90° ELBOWS PERMITTED = 3
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